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<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    // let if = 10
    let num1 = 'pink老师'
    let num2 = '戚薇'
    let temp
    // 都是把右边给左边
    temp = num1
    num1 = num2
    num2 = temp
    console.log(num1, num2)
  </script>
</body>

</html>